Machine for grinding the ends of arbors for the balance wheels of clocks or similar articles



'Mch 31. 1925.

MACHINE FOR GRINDING THE ENDS oF ARBoRs .FCR .THE BALANCE vlli'ivrh's ggCLOCKS 0R SIMILARv ARTICLES r A Filed March 31, 1925 V 4 Sheets-Sheet1-.

IIIHIII'/ "HWI MI HI Il' munnunmn 1w' MINI, NIH llf" March 31, 1925.

1,531,281 waans 'CF J. F7, vGARBIN MACHINE Fon GRINDING THE Enns oFAnBoRs Fon THE: BALANCE CLOCKS 0R SIMILAR ARTICLES Filed Ilarch 31, 19234 SheetslSheet 2 STW ' 'Marh 31'. 1925.

1,531,211.: GARBIN ARBORS FOR THE BALANCE WHEELS' 0F IMU-AR ARTICLES J.F. MACHINE FOR GRINDING THE ENDS OF CLOCKS OR S Filed March 31, 1925 gyW .Wi/W

Patented Mari. 31, 1925. y l l UNITED, STATES JULES F. GARIBIN. OF`WIINS'IED, CONNECTICUT, ASSIGNOR TO WILLIAM L. GILBERT` PATENTloFFici-z;

' CLOCK COMPANY,4 OF WINSTED, CONNECTICUT, A CORPORATION OF CONNECTICUT.

MACHINE non. GRINDING THE ENDS OF ARBORS FOR'THE BALANCE WHEELS 0FCLOCKS OR SIMILAR ARTICLES.

Application led March 31, 1923. Serial No. 629,608.

,To all whom t may conorn:

Be it known that I, JULES F. GARBIN, acitizen of the United States,residing at Winsted, county of Litchfield,.State of Connecticut, haveinvented a certain new and useful Improvement in Machines for Grindingthe Ends 'of Arbors for the Balance Wheels of Clocks or SimilarArticles, of which the following is a full, clear, and exactdescription.

My invention relates Vto machines for grinding arbors for the balancewheels of clocks or similar articles, and has for its object to provideamachine of this character which is simple in construction and highlyeiiicient in operation.

'The following isa description of my invention reference being had tothe accompanying drawings, in which,-.

Figure 1 is a view in perspectiveof a p0rtion of a machine embodylng thefeatures of the invention in their preferred form;

. Fig. 2 is a sectional plan view of the same taken substantially on theline 2-2 of Fig. 3; Y

Fig. 3 is a sectional view, on an enlarged scale, taken on the line 3 3of Fig. 2;

Fig. 4 is a side elevation, partly in secl tion and with parts brokenaway, of the machine; and

Fig. 5 is a detail sectional view, on an en-Y largcdscale, taken on theline 5-5 of Fig. 4.

The machine illustrated in the drawings is particularly adapted for usein grinding the ends of arbors `for the balance wheels of-clocks, ktheends of the arbors. bein previously pointed and hardened. As own,

the machine is provided with a magazine 2,

a ycarrier wheel 4 `for7feeding theA arhors from the magazine 'anddischarging them through an aperture 6 in a base plate 8 of the' machineframe and. grinding wheels 10 and 12 for operating on the ends ofthearhors, respectively, as thearbors are being carried by the carrierwheel. The axes of the wheels 10 and 12 are respectively above. andbelow the horizontal plane passing through the axis of the carrier. Themagat zine 2 is secured on a bracket 13 on the base plate 8 andcomprises a hopper having an upwardly and rearwardly inclined bottomwall 14 and vert-ical sides 16. The carrier wheel is carried hy a shaft18 which extends through and is` journaled in bearings in plate-8. Thecarrier wheel 4 is provided with a series of transversely extendingsemi-cylindrlcal recesses 34 in its periphera surface, the'rccessesbeing of suitable size to receive the arbors from the magazine duringthe rotation of the carrier wheel.

The grinding wheels 10 and 12 preferably of emery are mounted on theinner ends of shafts 36 which are journaledin bearings in blocks 38mounted on the 'base plate 8. The shafts 36 are eachfdriven through apulley 40 secured on its shaft between the Shaft bearings on the block38. The axes of the polishing or rinding wheels'lO and 12 are arrangedat .t e proper angle with relation to the .axis of the carrier wheel 4to bring their peripheral surfaces in position to effectively act on theends of the arbors, and the axis of the polishin wheel 10 is spaced adistance a ve the plane of the airis of the carrier wheel 4, and the orgrinding axis of the grinding wheel 12 is spaced a "distance below theplane of the axis of the carrier wheel so that the arbors arerst actedupon by the grinding wheel lO and then after passing t e plane of theaxis of the carrier wheel 4 are acted upon by theA grinding wheel 1,2.The machine is further provided with means for spinning the arbors inthe recesses while they are being acted'upon by`the grinding wheels andfor positioning the arbors in the recesses as they grinding wheels actto spin the arbors in the' recesses againstthe action thereon oflthegrinding wheels, the belt being driven at .horizontal plane of the axisof the carrierwheel. The pulley 44 is carried by a shaft 48 whichextends through and is journaled in bracket arms 50 mounted on themachine base plate 8, the shaft being driven through a belt and pulley52 carried thereby. The

pulley 46 is loosely mounted on a stud 54 secured on the free end of anarm 56 pivotally mounted on a pin 58 secured in a hanger 60 on theunderside of the base plate 8. The arm 56 is urged `downwardly to place thedesired tension on the belt 42 by means of a coiled spring 62 having oneend secured to the free end of the arm 56 and its other end secured to adepending post 64 on the under side of the base plate 8.

The belt pulleys 44 and 46 are so positioned with relation to each otherthat the belt is inclined slightly with relation to the plane ofrotation of the carrier wheel so that the belt as it is being driventends to shift the arbors engaged thereby axially toend ward the left,viewing Fig. 5. As the arbors are carried into position to be engaged bythe belt, however, their left-hand ends are brought into engagement withthe free portion of a spring arm 66 which is secure by a screw 68 to aguide plate 70 hereinafter described. As the ends of the arbors rideover the spring arm 66 they are shifted by the arm toward the rightuntil their ri ght-hand ends are brought into engagementwith a guideplate 72 hereinafter described, this shifting movement of the arborsbeing effected against the action of the belt 42. While the right-handends of the arbors are in engagement with the guide plate 72 they arecarried by the carrier wheel into engagement with the peripheral surfaceof the grinding wheel 10 at a little distance above its center. Uponengagement with the inding wheel, the curved end of the spring arm 66permits them to be shifted by the belt 42 toward the left across theperipheral surface of the grinding wheel 10 and this shifting movementof thel arbors toward the left continues as they approach the plane ofthe axis of the carrier wheel, the ends of the arbors leaving thegrinding wheel when the arbors are near the -plane of the axes of thecarrier.. wheel and grinding'wheel 10. This -completes the grindingoperation on the right-hand ends of the arbors. As the arbors pass thefree end of the spring arm 66 at about the plane of the axis of thecarrier wheel their' shifting movement toward the left by the action ofthe belt 42 continues so as to first bring the left-hand endsof thearbors in contact with the inner portion of the peripheral surface ofthe grindingv Wheel 12 near the plane common to its axis and the axis ofthe carrier wheel and then to shift the arbor ends across the peripheralsurface of the grinding wheel 12 until their left-hand ends are Ibroughtinto engagement with the guide plate which prevents further shiftingmovement of the arbors by the action of the belt 42 and thus positivelydetermines the extent of the grinding action on the lefthand end of thearbors.

The axial movements of the arbors are thus effected by the guide arm 66and the belt 42 and in the embodiment shown the movement during bothgrinding actions is all due to the belt and in one direction, this beingpreferable. After each arbor passes the grinding wheels 12 it is carriedby the carrier wheel to a position directly above the aperture 6 throughwhich it is permitted t0 drop into a receptacle located beneath themachine, a spring plate 74 being suitably arranged to engage the arborsafter they reach a position above the aperture 6 to insure theirdischarge from the carrier wheel. As shown the plates 70 and 7 2 arearranged substantially in alinement with the inner faces of the verticalsides of the magazine.

2 and the forward portions' of the plates are cut away at 76 so as toclosely surround threaded through central apertures in saidprojectionswith their ends abutting said bracket arms. Byadjusting the screws 8Oand 82 the guide plates 70 and 72 may be adjusted as desired toward andfrom the peripheral surfaces of the grinding wheels 10 and 12.

To insure the arbors being properly maintained in the recesses in thecarrier wheel as they are being operated upon, a pair of guide plates 84are provided having their rear edges curved so as to follow the contour1 of the peripheral surface of the carrier wheel and to almost engagethe cylindrical surfaces of the arbors adjacent to opposite edges of thefriction belt 42. The guide 'plates 84 are secured by a bolt 86 to ablock 88 mounted on the base plate 8.

From the foregoing it will be apparent that the machine operatesentirely automatically to feed the arbors from the magazine and intoposition to be opcratedupon by the grinding wheels and, after beingoperated upon bythe grinding wheels to discharge them from the machine.Also that the arrangement of the grinding wheels and the devices forpresenting the arbors to the lll) action of the grinding wheels is suchas to insure the ends of the arbors being ground rapidly and with auniform degree of accuracy.

The blocks 38 on which the grinding wheel shafts are mounted areVadapted to be adjusted to adjust the position of the grinding wheels atright angles to their axes to corn-- wheel carrying blocks 38v areadsjustably mounted on the'base plate 8 by means of guide bars 90secured on the base plate and received in longitudinally extendinggrooves in the blocks 38. An adjusting screw 92 eX- tends through anelongated slaot 94 in each block 38 and is screw-threaded into the bar90, and an adjusting screw 96 is screwthreaded into the forward end ofeach block and is held from axial movement by collars 98 thereonarranged at opposite sides of a stop member 100 secured to the baseplate 8, the adjusting screw 96 extending through a slot in the member100 so that by loosening the screw 92 land adjusting the screw 96 eachblock 38 may be adjusted as desired. i

In operation the carrier is preferably driven so as to revolve at therate of about two revolutions per minute while the belt 42 is driven soas to rotate the arbors on their axes at about 3000 revolutions perminute, and the grinding wheels 10 and 12 are driven at the rate of10,000 revolutions r minute.

As will be evident to those Vskilled ink thev art, my invention permitsof various modi lar articles having tapered ends having, in

combination, a magazine, means comprising a rotating carrier wheel forfeeding articles having tapered ends from the magazine with the ends ofthe rarticles projecting beyond the sides of the wheel, and means forrinding rst one and 'then the other oft e tapered ends of the articlesas they are being thus fed.

2. A machine for grinding the ends of arbors for the balance wheels ofclocks or similar articles having tapered ends having, in combination, amagazine, means comprising a rotating carrier wheel for feeding articleshaving tapered ends from the' magazine with the ends of the articlesprojecting be ond the sides of the wheel, means for shifting thearticles axially first in one direction and then the other on thecarrier wheel, anda pair of rotating grinding wheels constructed andarranged to grind the tapered ends of each article during said shiftingmovements thereof, respectively.

3. A machine for grinding the ends of arbors 'for the balance wheels ofclocks er similar articles having tapered ends havin, in combination, arotating carrierv wheel having recesses in its peripheral surface forreceiving articles having tapered ends with the ends of the articlesprojecting beyond 1 the sides of the wheel, and means for grinding thetapered ends of the articles comprising a pair of rotating grindingwheels, means cooperating with said carrier wheel to axially shift eacharticle in its recess in one direction, and a traveling belt passingover a portion of the peripheral surface of said wheel in a planeinclined to the axis of rotation ofsaid wheel so as to rotate saidarticles in said recesses, and impart an endwise thrust thereto in theother direction so` that the ends of said article are successivelypresented to the action of. said grinding wheels, respectively.

4. A machine for -griiiding the ends of.

arbors for the balance wheels of clocks oi' similar articles havingtapered ends having, in combination, a rotating carrier wheel havingrecesses in its peripheral surface for receiving articles with thetapered ends of the articles projecting beyond the sides of the wheel,and means for grind-` ing the ends of the articles comprising a pair ofrotating ygrinding wheels, and means for shifting said articles axiallyin one direction so as to present the end of each of -them as they arebeing fed to one'of said grinding wheels, and a traveling belt passingover a portion of the peripheral surface of said wheel in the samedirection as the direction of rotation of said wheel but at a greaterspeed vso as to rotate said articles .in said recesses, the direction oftravel of said belt being at an acute angle to the plane of rotation ofsaid wheel so as t0 shift said articles axially in the other directionafter being-presented to said first grinding wheel, to present itsopposite end to the other grinding wheel.

5. A machine for grinding the eiidsof arbors for the balance wheels ofclocks or similar articles having tapered ends having, iii combination,a rotating carrier wheel hav- 'ing recesses in its peripheral surfacefor surface of said wheel in the same direction as'the direction ofrotation of said wheel but at a greater speed so as to rotate saidarticles in said recesses, the direction ot' travel of said belt beingatan acute angle shifted by said belt.

6. A machine for grinding the ends of arbors for the balance Wheels ofclocks or similar articles having tapered ends having, in combination, apair of rotating grinding Wheels spaced apart and means for feeding aplurality of articles and successively presenting the ends of each ofthem to the action of the grinding Wheels, respectively.

7. A machine for grinding the ends of arbors for the balance Wheels ofclocks or similar articles having tapered ends having, in combination, arotating carrier Wheel having recesses in its peripheral surface forreceiving the articles with one end of each article projecting beyondthe side of the wheel, a traveling belt passing over a portion of theperipheral surface of said Wheel, means to move said belt relatively tosaid carrier Wheel so as to rotate said articles in said recesses, arotating grinding Wheel constructed and arranged to act on saidprojecting end of each article as it is being rotated in its recess, andmeans for moving the articles longitudinally in their recesses as theyare being acted upon by the grinding wheel.

8. A machine for grinding the ends of arbors for the balance Wheels ofclocks or similar articles having tapered ends having, in combination, arotating carrier Wheelhaving recesses in its peripheral surface forreceiving the articles withv one end of each article projecting beyondthe side of the wheel, a rotating grinding Wheel constructed andarranged so as to cause its peripheral surface to act on said projectingend of each article as the article is being carried by the wheel, forrotating said article in" its recess and for moving said article andsaid grinding wheel axially with relation to each other as the articleis being acted upon by the Wheel.

9. A machine for grinding the ends of arbors for the balance wheels ofclocks or similar articles having tapered ends having, in combination, arotating carrier Wheel having recesses in its peripheral surface forreceiving the articles with the ends of the articles projecting beyondthe sides of the wheel, means for shifting each article axially first inone direction and then the other, and for rotating the articles in therecesses, and a pair of rotating grinding Wheels for acting successivelyon the ends of the articles during their shifting movement in one ofsaid directions.

10. A machine for grinding the ends of arbors for the balance wheels ofclocks or similar' articles having tapered ends havof said Wheel so asto tend to shift said articles axially in one direction, a` guidingmember comprising a spring arm arranged to be engaged by one end of saidarticles to shift the articles in the opposite direction against theaction of said belt and to permit the shifting action of said belt to be.effective to shift the ,articles in said first mentioned direction astheir ends approach and ride olf of the free end of said spring arm, anda pair of rotating grinding wheels constructed and arranged to actsuccessively on the ends of the articles While the articles are vbeingshifted by the belt.

1]. A machine for grinding the ends of arbors for the balance wheels ofclocks 0r similar articles having tapered ends having, in combination, arotating carrier wheel having recesses in its. peripheral surface forreceiving the articles with the ends ofthe articles projectingbeyond thesides of the Wheel, a traveling belt passing over a portion of theperipheral surface of said Wheel in the same direction as the directionof rotation of said wheel but at a greater speed so as to rotate saidarticles in said recesses, the direction of travel of said belt being atan acute angle to the plane of rotation of said Wheel so as to tend toshift said articles axially in one direction, means for' shifting saidarticles axially in the opposite direction to a predetermined positionand then to permit the shifting action of said belt to be effective toshift said articles in said first-mentioned direction, guiding membersarranged to be engaged by the ends of the articles to positively limittheir shifting movements in either direction, respec` Y about the axisof the wheel and then discharging them from the machine, a belt passingover a portion of the peripheral surface of the carrier wheel, in thesame direction as the direction of vrotation of said 4 clined at anacute angle to the carrier wheel but at a greater s d and inane ofrotation of the wheelso as to ten to shift the articles axially in onedirection in the recesses, means including a spring for tensioning thebelt, means for shifting each article axially in the opposite directionto a predetermined position and then permitting the belt to shift thearticle in said first mentioned direction, and a pair of grinding wheelsconstructed and arranged to act successively on the ends of each articleWhile the article is being lshifted by the belt.

`13. A machine for grinding the ends' of arbors forl the balance wheelsof clocks or similar articles having tapered ends having, incombination, a rotating carrier wheel having recesses in itsperipheral'surface for receiving articles having tapered ends With theends of the articles projecting beyondf the sides of the wheel,means forgrinding one ofthe ends of the articles comprising `a grinding wheel,and means comprising a traveling belt passing over a portion of theperipheral surface of said wheel, and in a plane inclined to the axisofrotation of said Wheel for moving the article longitudinally duringthe grinding operation.

14. Mechanism for feeding arbors for the balance wheels ofclocks orsimilar articles having, in combination, a rotating carrier wheel havingtransverse recesses in its 'peripheral surface for receiving the artices, and means comprising a traveling belt passing over a portionof theperipheral surface of said wheel and in va plane inclined to the axis ofrotation of said wheel for moving the articles longitudinally in their'JULES F. GARBN.

